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Title: High-power, compact, ultra-wideband pulser
Author(s): Lee, C.H.; Funk, E.E.; Jasper, L.J., Jr.
Author's Affiliation: Dept. of Electr. Eng., Maryland Univ., College Park, MD, USA
Editor(s): Carin, L.; Felsen, L.B.
Source: Ultra-Wideband, Short-Pulse Electromagnetics 2. Proceedings of the Second International Conference. New York, NY, USA: Plenum Press, 1995. p. 51-8.
ISBN: 0-306-45002-X
Language: English
Conference Information: Proceedings of 2nd International Conference on Ultra-Wide Band, Short-Pulse Electromagnetics. Brooklyn, NY, USA, 7-9 April 1994
Abstract: In developing a pulsed ultra-wideband (UWB) radiation system some of the primary requirements are short pulse-width, jitter-free operation, and portability. The optical system which we present addresses all of these issues. The optically triggered UWB pulser consists of several units. The heart of the pulser is a photoconductive switch (PCS). The PCS works on the principle of picosecond photoconductivity. When illuminated with an optical pulse, the conductivity of a photoconductor will rise in response to the electron-hole pairs generated by absorbed photons. The rise in conductivity can easily be of the order of picoseconds if a picosecond rise-time optical pulse is used. Furthermore, the triggering of the PCS occurs without jitter compared to the optical pulse. Thus we can generate a fast-rise time pulse optically and use the PCS to generate a fast-rise time electrical pulse. The electrical pulse is then sent to a UWB antenna where it is radiated into free space. The key feature of this technique is the jitter-free nature of the electrical pulses which are produced. If a mode-locked laser is used as the optical trigger, we note that the laser repetition rate is locked in synchronization with a master oscillator (frequency synthesizer). Hence, the external electronics can easily be synchronized to the laser pulse-train through the master oscillator. Abstract Number(s): B9610-4320-002
INSPEC Heading(s): frequency synthesizers; high-speed optical techniques; laser mode locking; photoconducting switches; pulse generators; pulsed power switches; receiving antennas; transmitting antennas
Key Phrase Heading(s): ultra-wideband pulser; high power compact pulser; pulsed ultrawideband radiation system; short pulse width; jitter free operation; portability; optical system; optically triggered UWB pulser; photoconductive switch; picosecond photoconductivity; optical pulse; conductivity; electron-hole pairs; picosecond rise-time optical pulse; fast rise time pulse generation; fast rise time electrical pulse; UWB antenna; mode-locked laser; laser repetition rate; master oscillator; frequency synthesizer; laser pulse-train
Classification: B4320 Lasers
B5270 Antennas
B4250 Photoelectric devices
Treatment: Application; Practical; Theoretical or Mathematical; Experimental
Number of references: 7
Publication Type: Conference Paper
Accession Number: 5362179
Copyright Information: Copyright 1996, IEE
Database: Inspec
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